AIRBAG SYSTEM, Diagnostic DTC:B1642/81, B1643/81

DTC Code DTC Name
B1642/81 Lost Communication with Side Satellite Sensor Bus RH
B1643/81 Side Satellite Sensor Bus RH Initialization Incomplete

DESCRIPTION

Each of the side airbag sensor assembly RH, rear airbag sensor RH and door side airbag sensor RH is composed of a safing sensor, diagnostic circuit, lateral deceleration sensor, etc. When the airbag sensor assembly receives a signal from the lateral deceleration sensor, the airbag sensor assembly judges whether the SRS should be activated.If a malfunction is detected in the side satellite sensor bus circuit, the airbag sensor assembly stores DTCs B1642/81 and/or B1643/81.

DTC No. Detection Item DTC Detection Condition Trouble Area Test Mode / Check Mode
B1642/81 Lost Communication with Side Satellite Sensor Bus RH

  • The airbag sensor assembly detects a line short, short to ground or B+,or an open in the door side airbag sensor RH circuit.

  • Side airbag sensor assembly RH malfunction

  • Rear airbag sensor RH malfunction

  • Door side airbag sensor RH malfunction

  • Airbag sensor assembly malfunction

  • Floor wire No.2

  • Side airbag sensor assembly RH

  • Rear airbag sensor RH

  • Door side airbag sensor RH

  • Front door wire RH

  • Airbag sensor assembly

 Does not apply to test/check mode
B1643/81 Side Satellite Sensor Bus RH Initialization Incomplete

  • The airbag sensor assembly detects a line short, short to ground or B+,or an open in the door side airbag sensor RH circuit.

  • Side airbag sensor assembly RH malfunction

  • Rear airbag sensor RH malfunction

  • Door side airbag sensor RH malfunction

  • Airbag sensor assembly malfunction

  • Floor wire No.2

  • Side airbag sensor assembly RH

  • Rear airbag sensor RH

  • Door side airbag sensor RH

  • Front door wire RH

  • Airbag sensor assembly

 Does not apply to test/check mode

WIRING DIAGRAM

A01MHQWE07
*a Side Airbag Sensor Assembly RH
*b Door Side Airbag Sensor RH
*c Rear Side Airbag Sensor RH
*d Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note


  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here

  • When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Click here

  • After replacing the airbag sensor assembly, refer to initialization.

    Click here

Tech Tips

To reproduce the DTC, wiggle each of the SRS airbag system connectors, or drive the vehicle on actual city roads or rough roads.

Click here

PROCEDURE


  1. CHECK DTC


    1. Turn the power switch off.

    2. Turn the power switch on (IG), and wait for at least 60 seconds.

    3. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    4. Turn the power switch off.

    5. Turn the power switch on (IG), and wait for at least 60 seconds.

    6. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Result Proceed to
      DTC B1642/81 or B1643/81 is output A
      DTC B1642/81 or B1643/81 is not output B

      Tech Tips

      Codes other than DTC B1642/81 and B1643/81 may be output at this time, but they are not related to this check.


    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. CHECK CONNECTION OF CONNECTORS


    1. Turn the power switch off.

    2. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.

    3. Check that the connectors are properly connected to the airbag sensor assembly and side airbag sensor assembly RH.

      OK
      The connectors are properly connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  3. CHECK CONNECTORS


    1. A01MHL6C01
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire

      Disconnect the connectors from the airbag sensor assembly and side airbag sensor assembly RH.

    2. Check that the terminals of the connectors are not deformed or damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  4. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH CIRCUIT


    1. A01MFOWC01
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Side airbag sensor assembly RH)
      *b

      Rear view of wire harness connectorear

      (to Airbag Sensor Assembly)
      *c Service Wire

      Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 2 seconds.

    2. Turn the power switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      Q3-4 (BBR+) - Body ground Power switch on (IG) Below 1 V
      Q3-3 (BBR-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

    5. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 17 (BBR+) and 18 (BBR-) of connector B.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q3-4 (BBR+) - Q3-3 (BBR-) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q3-4 (BBR+) - Q3-3 (BBR-) Always 1 MΩ or higher

    10. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q3-4 (BBR+) - Body ground Always 1 MΩ or higher
      Q3-3 (BBR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  5. CHECK SIDE AIR BAG SENSOR ASSEMBLY RH


    1. A01MIISC01
      *1 Side Airbag Sensor Assembly LH
      *2 Airbag Sensor Assembly

      Connect the connector to airbag sensor assembly.

    2. Interchange the side airbag sensor assembly RH with LH and connect the connectors.

    3. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 2 seconds.

    4. Turn the power switch on (IG), and wait for at least 60 seconds.

    5. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the power switch off.

    7. Turn the power switch on (IG), and wait for at least 60 seconds.

    8. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Result Proceed to
      DTC B1642/81 or B1643/81 is output A
      DTC B1647/82 or B1648/82 is output B
      DTC B1642/81, B1643/81, B1647/82 and B1648/82 are not output C

      Tech Tips

      Codes other than DTCs B1642/81, B1643/81, B1647/82 and B1648/82 may be output at this time, but they are not related to this check.

    9. Turn the power switch off.

    10. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.

    11. Return the side airbag sensor assembly RH and LH to their original positions and connect the connectors.


    B

    REPLACE SIDE AIR BAG SENSOR ASSEMBLY RH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  6. CHECK CONNECTION OF CONNECTORS


    1. Check that the connectors are properly connected to the rear airbag sensor assembly RH.

      OK
      The connectors are properly connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  7. CHECK CONNECTORS


    1. A01MIJ9C01
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 No. 2 Floor Wire

      Disconnect the connectors from the side airbag sensor assembly RH and rear airbag sensor RH

    2. Check that the terminals of the connectors are not deformed or damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  8. CHECK REAR AIRBAG SENSOR RH CIRCUIT


    1. A01MI5KC01
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Rear Airbag Sensor RH)
      *b

      Front view of wire harness connectorear

      (to Side Airbag Sensor Assembly RH)
      *c Service Wire

      Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 2 seconds.

    2. Turn the power switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      Q5-4 (BCR+) - Body ground Power switch on (IG) Below 1 V
      Q5-3 (BCR-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

    5. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 1 (BCR+) - 2 (BCR-) of connector B.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q5-4 (BCR+) - Q5-3 (BCR-) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q5-4 (BCR+) - Q5-3 (BCR-) Always 1 MΩ or higher

    10. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q5-4 (BCR+) - Body ground Always 1 MΩ or higher
      Q5-3 (BCR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  9. CHECK REAR AIRBAG SENSOR RH


    1. A01MJ3MC01
      *1 Airbag Sensor Assembly
      *2 Side Airbag Sensor Assembly RH

      Connect the connector to side airbag sensor assembly RH.

    2. Interchange the rear airbag sensor RH with LH and connect the connectors.

    3. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 2 seconds.

    4. Turn the power switch on (IG), and wait for at least 60 seconds.

    5. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the power switch off.

    7. Turn the power switch on (IG), and wait for at least 60 seconds.

    8. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Result Proceed to
      DTC B1642/81 or B1643/81 is output A
      DTC B1647/82 or B1648/82 is output B
      DTC B1642/81, B1643/81, B1647/82 and B1648/82 are not output C

      Tech Tips

      Codes other than DTCs B1642/81, B1643/81, B1647/82 and B1648/82 may be output at this time, but they are not related to this check.

    9. Turn the power switch off.

    10. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.

    11. Return the rear airbag sensor RH and LH to their original positions and connect the connectors.


    B

    REPLACE REAR AIRBAG SENSOR RH

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  10. CHECK CONNECTION OF CONNECTORS


    1. Check that the connectors are properly connected to the door side airbag sensor RH.

      OK
      The connectors are properly connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  11. CHECK CONNECTORS


    1. A01MJLRC01
      *1 Door Side Airbag Sensor RH
      *2 Rear Airbag Sensor RH
      *3 Front Door Wire RH
      *4 No. 2 Floor Wire

      Disconnect the connectors from the rear airbag sensor RH and door side airbag sensor RH.

    2. Check that the terminals of the connectors are not deformed or damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT DOOR WIRE RH

    OK

  12. CHECK DOOR SIDE AIRBAG SENSOR RH CIRCUIT


    1. A01MJW4C01
      *1 Door Side Airbag Sensor RH
      *2 Rear Airbag Sensor RH
      *3 Front Door Wire RH
      *4 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Door Side Airbag Sensor RH)
      *b

      Front view of wire harness connectorear

      (to Rear Airbag Sensor RH)
      *c Service Wire

      Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 2 seconds.

    2. Turn the power switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      L7-2 (BDR+) - Body ground Power switch on (IG) Below 1 V
      L7-1 (BDR-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

    5. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 1 (BDR+) - 2 (BDR-) of connector B.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      L7-2 (BDR+) - L7-1 (BDR-) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      L7-2 (BDR+) - L7-1 (BDR-) Always 1 MΩ or higher

    10. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      L7-2 (BDR+) - Body ground Always 1 MΩ or higher
      L7-1 (BDR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK NO. 2 FLOOR WIRE Click here

    OK

  13. CHECK DOOR SIDE AIRBAG SENSOR RH


    1. A01MFZQC01
      *1 Door Side Airbag Sensor LH
      *2 Rear Airbag Sensor RH

      Connect the connector to rear airbag sensor RH.

    2. Interchange the door side airbag sensor RH with LH and connect the connectors.

    3. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 2 seconds.

    4. Turn the power switch on (IG), and wait for at least 60 seconds.

    5. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the power switch off.

    7. Turn the power switch on (IG), and wait for at least 60 seconds.

    8. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Result Proceed to
      DTC B1642/81 or B1643/81 is output A
      DTC B1647/82 or B1648/82 is output B
      DTC B1642/81, B1643/81, B1647/82 and B1648/82 are not output C

      Tech Tips

      Codes other than DTCs B1642/81, B1643/81, B1647/82 and B1648/82 may be output at this time, but they are not related to this check.

    9. Turn the power switch off.

    10. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.

    11. Return the door airbag sensor RH and LH to their original positions and connect the connectors.


    A

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    B

    REPLACE DOOR SIDE AIR BAG SENSOR RH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

  14. CHECK NO. 2 FLOOR WIRE


    1. A01MHWIC01
      *1 Door Side Airbag Sensor RH
      *2 Rear Airbag Sensor RH
      *3 Front Door Wire RH
      *4 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Door Side Airbag Sensor RH)
      *b

      Front view of wire harness connectorear

      (to Rear Airbag Sensor RH)
      *c Service Wire

      Disconnect the floor wire no.2 connector from the front door wire RH.

    2. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 2 seconds.

    3. Turn the power switch on (IG).

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      LQ1-1 (BDR+) - Body ground Power switch on (IG) Below 1 V
      LQ1-2 (BDR-) -Body ground Power switch on (IG) Below 1 V

    5. Turn the power switch off.

    6. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.

    7. Using a service wire, connect terminals 1 (BDR+) - 2 (BDR-) of connector B.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      LQ1-1 (BDR+) - LQ1-2 (BDR-) Always Below 1 Ω

    9. Disconnect the service wire from connector B.

    10. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      LQ1-1 (BDR+) - LQ1-2 (BDR-) Always 1 MΩ or higher

    11. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      LQ1-1 (BDR+) - Body ground Always 1 MΩ or higher
      LQ1-2 (BDR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT DOOR WIRE RH

    NG

    REPLACE NO. 2 FLOOR WIRE